Planning Register
South Dublin County Council · SD24B/0373 · Permission

21, Ashton Close, Knocklyon, Dublin 16

Data updated 12 Sept 2026 · register lag up to 7 days · sources & freshness

Council received 23 Aug 2024We first saw it 11 Sept 2026, 18:51 (750 days after receipt — sources refresh weekly)
Applications only for this county. Appeals, zoning, RZLT and consultations: Dún Laoghaire-Rathdown and Fingal only for now.

SD24B/0373 is a planning application for permission at 21, Ashton Close, Knocklyon, Dublin 16, received by South Dublin County Council on 23 Aug 2024 and first seen by Planning Register on 11 Sept 2026. The application describes: Works to existing 2 storey dwelling, including 1. Demolition of existing single storey garage to side of dwelling and rear single storey extension; 2. Construction of new single storey extension to side and rear of dwelling; 3. 1st floor extension to rear and side of dwelling and all associated site development works. The council granted permission on 15 Oct 2024. The five-week observation window closed on 27 Sept 2024. A commencement notice (CN0143051SD) was lodged on 2 Jun 2026, so works have started on site. The site is zoned R2 — existing residential under the South Dublin County Council development plan. Within 500 m there are 75 other decided applications in the last five years and 6 appeals.

Appeal window closes 12 Nov 2024 closed 670 days ago
4 weeks from the council's decision (15 Oct 2024) · s.37 Planning and Development Act 2000 · €220 to An Coimisiún Pleanála (€110 observer)
Council registerSite report

Proposal

Works to existing 2 storey dwelling, including 1. Demolition of existing single storey garage to side of dwelling and rear single storey extension; 2. Construction of new single storey extension to side and rear of dwelling; 3. 1st floor extension to rear and side of dwelling and all associated site development works

Status
Final Grant
Decision
Grant permission on 15 Oct 2024
Final grant
28 Nov 2024
Permission expires
27 Nov 2029
Floor area
70 m²
Site (from polygon)
295 m²
Location precision
site (coords_polygon)

Timeline

  • 23 Aug 2024
    New application
    Observation window closed 27 Sept 2024
  • 15 Oct 2024
    Decision
    Appeal window closed 12 Nov 2024

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Appeal

Not appealed.

Commencement

  • Opt out commencement notice CN0143051SD
    2 Jun 202621 Ashton Close, Dublin, D16 V528matched by ref_exact

Zoning at the site

R2 — Existing residential

RES: To protect and/or improve residential amenity

An established residential area. The objective is to protect existing residential amenity as well as to provide housing — which is the objective a neighbour's objection to an overbearing extension is usually argued under.

Designations within 250 m

No OPW flood extent nearby.

  • Radon risk area · 1
    About 1 in 20 homes in this area is likely to have high radon levels

Provenance

Register row from the national planning applications feed (NPAD), fetched 11 Sept 2026, 18:51 (store id 100042). Deadlines were computed by the store from the received / decided dates under the Planning and Development Act 2000 and are recorded as events, not recomputed here. Council register: https://planning.agileapplications.ie/southdublin/application-details/66750.

Source: npad · fetched 11 Sept 2026, 18:51
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npadCC-BY-4.011 Sept 2026, 18:51open